This paper presents a decision support system whose modules are geographically distributed and interfaced both amongst each other and with users via the World Wide Web. The data management sub—system consists in an Oracle database, resident on a host at the Joint Research Centre, while the model management sub—system consists in a set of optimisation routines installed at the University of Bologna. Its access, restricted by a project—dependent security policy, is potentially available to any HTTP client. The support to unconstrained data maintenance and access required the development of new HTML/Oracle gateways.